.B grav
[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-ncolors \fIinteger\fP] [\-delay \fImicroseconds\fP] [\-count \fIinteger\fP] [\-decay] [\-no\-decay] [\-trail] [\-no\-trail]
+[\-fps]
.SH DESCRIPTION
The \fIgrav\fP program draws a simple orbital simulation
.SH OPTIONS
or the id number (decimal or hex) of a specific visual.
.TP 8
.B \-ncolors \fIinteger\fP
-How many colors should be used (if possible). Default 200.
+How many colors should be used (if possible). Default 64.
The colors are chosen randomly.
.TP 8
.B \-count \fIinteger\fP
.TP 8
.B \-decay
.TP 8
-.B \-no-\decay
+.B \-no\-decay
Whether orbits should decay.
.TP 8
Whether the objects should leave trails behind them (makes it look vaguely
like a cloud-chamber.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
.SH ENVIRONMENT
.PP
.TP 8
both that copyright notice and this permission notice appear in
supporting documentation.
.SH AUTHOR
-Greg Bowering <greg@smug.student.adelaide.edu.au>, 1993.
+Greg Bowering <gb@pobox.com>, 1993.
Ability to run standalone or with \fIxscreensaver\fP added by
-Jamie Zawinski <jwz@netscape.com>, 10-May-97.
+Jamie Zawinski <jwz@jwz.org>, 10-May-97.